personally, i would wait for another day or two then clip it. i've heard diffrent oppinions on that toppic. my synopsis is the plant is moving its nutrients from the leaf to the growing buds. although its not a necessity, any little bit helps right?! dont worry though, its perfectly normal for the leafs to slowly die off in the final stages of its life cycle. i never let leaves completly die and fall off on thier own, although i have heard people say its good practice to leave them on. i will however wait until the leaf changes colors between 50-75% before clipping it. my reasoning is the plant will concentrate more on the final developement of the buds, also getting most the nutrients out of the leaves, and less energy on preperation of dying leaves. just my opinion though.... id say its a judgement call. -good luck-